Merge "system/core: add libpackagelistparser"

packagelistparser/Android.mk

@@ -0,0 +1,32 @@
+LOCAL_PATH:= $(call my-dir)
+
+#########################
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libpackagelistparser
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := packagelistparser.c
+LOCAL_COPY_HEADERS_TO := packagelistparser
+LOCAL_COPY_HEADERS := packagelistparser.h
+LOCAL_SHARED_LIBRARIES := liblog
+
+LOCAL_CLANG := true
+LOCAL_SANITIZE := integer
+
+include $(BUILD_SHARED_LIBRARY)
+
+#########################
+include $(CLEAR_VARS)
+
+
+LOCAL_MODULE := libpackagelistparser
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := packagelistparser.c
+LOCAL_COPY_HEADERS_TO := packagelistparser
+LOCAL_COPY_HEADERS := packagelistparser.h
+LOCAL_STATIC_LIBRARIES := liblog
+
+LOCAL_CLANG := true
+LOCAL_SANITIZE := integer
+
+include $(BUILD_STATIC_LIBRARY)

packagelistparser/packagelistparser.c

@@ -0,0 +1,266 @@
+/*
+ * Copyright 2015, Intel Corporation
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Written by William Roberts <william.c.roberts@intel.com>
+ *
+ */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/limits.h>
+
+#define LOG_TAG "packagelistparser"
+#include <utils/Log.h>
+
+#include "packagelistparser.h"
+
+#define CLOGE(fmt, ...) \
+    do {\
+        IF_ALOGE() {\
+            ALOGE(fmt, ##__VA_ARGS__);\
+        }\
+    } while(0)
+
+static size_t get_gid_cnt(const char *gids)
+{
+    size_t cnt;
+
+    if (*gids == '\0') {
+        return 0;
+    }
+
+    if (!strcmp(gids, "none")) {
+        return 0;
+    }
+
+    for (cnt = 1; gids[cnt]; gids[cnt] == ',' ? cnt++ : *gids++)
+        ;
+
+    return cnt;
+}
+
+static bool parse_gids(char *gids, gid_t *gid_list, size_t *cnt)
+{
+    gid_t gid;
+    char* token;
+    char *endptr;
+    size_t cmp = 0;
+
+    while ((token = strsep(&gids, ",\r\n"))) {
+
+        if (cmp > *cnt) {
+            return false;
+        }
+
+        gid = strtoul(token, &endptr, 10);
+        if (*endptr != '\0') {
+            return false;
+        }
+
+        /*
+         * if unsigned long is greater than size of gid_t,
+         * prevent a truncation based roll-over
+         */
+        if (gid > GID_MAX) {
+            CLOGE("A gid in field \"gid list\" greater than GID_MAX");
+            return false;
+        }
+
+        gid_list[cmp++] = gid;
+    }
+    return true;
+}
+
+extern bool packagelist_parse(pfn_on_package callback, void *userdata)
+{
+
+    FILE *fp;
+    char *cur;
+    char *next;
+    char *endptr;
+    unsigned long tmp;
+    ssize_t bytesread;
+
+    bool rc = false;
+    char *buf = NULL;
+    size_t buflen = 0;
+    unsigned long lineno = 1;
+    const char *errmsg = NULL;
+    struct pkg_info *pkg_info = NULL;
+
+    fp = fopen(PACKAGES_LIST_FILE, "re");
+    if (!fp) {
+        CLOGE("Could not open: \"%s\", error: \"%s\"\n", PACKAGES_LIST_FILE,
+                strerror(errno));
+        return false;
+    }
+
+    while ((bytesread = getline(&buf, &buflen, fp)) > 0) {
+
+        pkg_info = calloc(1, sizeof(*pkg_info));
+        if (!pkg_info) {
+            goto err;
+        }
+
+        next = buf;
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for \"package name\"";
+            goto err;
+        }
+
+        pkg_info->name = strdup(cur);
+        if (!pkg_info->name) {
+            goto err;
+        }
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for field \"uid\"";
+            goto err;
+        }
+
+        tmp = strtoul(cur, &endptr, 10);
+        if (*endptr != '\0') {
+            errmsg = "Could not convert field \"uid\" to integer value";
+            goto err;
+        }
+
+        /*
+         * if unsigned long is greater than size of uid_t,
+         * prevent a truncation based roll-over
+         */
+        if (tmp > UID_MAX) {
+            errmsg = "Field \"uid\" greater than UID_MAX";
+            goto err;
+        }
+
+        pkg_info->uid = (uid_t) tmp;
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for field \"debuggable\"";
+            goto err;
+        }
+
+        tmp = strtoul(cur, &endptr, 10);
+        if (*endptr != '\0') {
+            errmsg = "Could not convert field \"debuggable\" to integer value";
+            goto err;
+        }
+
+        /* should be a valid boolean of 1 or 0 */
+        if (!(tmp == 0 || tmp == 1)) {
+            errmsg = "Field \"debuggable\" is not 0 or 1 boolean value";
+            goto err;
+        }
+
+        pkg_info->debuggable = (bool) tmp;
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for field \"data dir\"";
+            goto err;
+        }
+
+        pkg_info->data_dir = strdup(cur);
+        if (!pkg_info->data_dir) {
+            goto err;
+        }
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for field \"seinfo\"";
+            goto err;
+        }
+
+        pkg_info->seinfo = strdup(cur);
+        if (!pkg_info->seinfo) {
+            goto err;
+        }
+
+        cur = strsep(&next, " \t\r\n");
+        if (!cur) {
+            errmsg = "Could not get next token for field \"gid(s)\"";
+            goto err;
+        }
+
+        /*
+         * Parse the gid list, could be in the form of none, single gid or list:
+         * none
+         * gid
+         * gid, gid ...
+         */
+        pkg_info->gids.cnt = get_gid_cnt(cur);
+        if (pkg_info->gids.cnt > 0) {
+
+            pkg_info->gids.gids = calloc(pkg_info->gids.cnt, sizeof(gid_t));
+            if (!pkg_info->gids.gids) {
+                goto err;
+            }
+
+            rc = parse_gids(cur, pkg_info->gids.gids, &pkg_info->gids.cnt);
+            if (!rc) {
+                errmsg = "Could not parse field \"gid list\"";
+                goto err;
+            }
+        }
+
+        rc = callback(pkg_info, userdata);
+        if (rc == false) {
+            /*
+             * We do not log this as this can be intentional from
+             * callback to abort processing. We go to out to not
+             * free the pkg_info
+             */
+            rc = true;
+            goto out;
+        }
+        lineno++;
+    }
+
+    rc = true;
+
+out:
+    free(buf);
+    fclose(fp);
+    return rc;
+
+err:
+    if (errmsg) {
+        CLOGE("Error Parsing \"%s\" on line: %lu for reason: %s",
+                PACKAGES_LIST_FILE, lineno, errmsg);
+    }
+    rc = false;
+    packagelist_free(pkg_info);
+    goto out;
+}
+
+void packagelist_free(pkg_info *info)
+{
+    if (info) {
+        free(info->name);
+        free(info->data_dir);
+        free(info->seinfo);
+        free(info->gids.gids);
+        free(info);
+    }
+}

packagelistparser/packagelistparser.h

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2015, Intel Corporation
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Written by William Roberts <william.c.roberts@intel.com>
+ *
+ * This is a parser library for parsing the packages.list file generated
+ * by PackageManager service.
+ *
+ * This simple parser is sensitive to format changes in
+ * frameworks/base/services/core/java/com/android/server/pm/Settings.java
+ * A dependency note has been added to that file to correct
+ * this parser.
+ */
+
+#ifndef PACKAGELISTPARSER_H_
+#define PACKAGELISTPARSER_H_
+
+#include <stdbool.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+/** The file containing the list of installed packages on the system */
+#define PACKAGES_LIST_FILE  "/data/system/packages.list"
+
+typedef struct pkg_info pkg_info;
+typedef struct gid_list gid_list;
+
+struct gid_list {
+    size_t cnt;
+    gid_t *gids;
+};
+
+struct pkg_info {
+    char *name;
+    uid_t uid;
+    bool debuggable;
+    char *data_dir;
+    char *seinfo;
+    gid_list gids;
+    void *private_data;
+};
+
+/**
+ * Callback function to be used by packagelist_parse() routine.
+ * @param info
+ *  The parsed package information
+ * @param userdata
+ *  The supplied userdata pointer to packagelist_parse()
+ * @return
+ *  true to keep processing, false to stop.
+ */
+typedef bool (*pfn_on_package)(pkg_info *info, void *userdata);
+
+/**
+ * Parses the file specified by PACKAGES_LIST_FILE and invokes the callback on
+ * each entry found. Once the callback is invoked, ownership of the pkg_info pointer
+ * is passed to the callback routine, thus they are required to perform any cleanup
+ * desired.
+ * @param callback
+ *  The callback function called on each parsed line of the packages list.
+ * @param userdata
+ *  An optional userdata supplied pointer to pass to the callback function.
+ * @return
+ *  true on success false on failure.
+ */
+extern bool packagelist_parse(pfn_on_package callback, void *userdata);
+
+/**
+ * Frees a pkg_info structure.
+ * @param info
+ *  The struct to free
+ */
+extern void packagelist_free(pkg_info *info);
+
+__END_DECLS
+
+#endif /* PACKAGELISTPARSER_H_ */